I think I figured out what I am going to do with the angry birds. I think I am going to get 2 poster boards, cut them to shape, paint them, and link them like a sandwich board. He'll wear plain clothes under neath it. I think this will be the cheapest option since all I will need to buy is 2 poster boards and some flat rope or something to link them. I think I might have an old belt I can use. This way, he'll get to put the poster on his wall when he's done wearing it.

ninja... I'd go with black pants and a long sleeve big baggy black t shirt. get some red fleece and make a strip to wrap around his waist. you can do another red strip around his forehead.